<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
  <style>
    #r1{color: green}
    .r2{color: blue}
    h1,h2{background-color: yellow}
    input[type='text']{background-color: red}
    *{
      border:1px solid red;
    }
  </style>
</head>
<body>
<ul>
  <li id="r1">张学友</li>
  <li class="r2">刘德华</li>
  <li>郭富城</li>
</ul>
<h1 class="r2">悟空</h1>
<h1>八戒</h1>
<h1>沙僧</h1>
<h2>刘备</h2>
<input type="text">
<input type="password">
</body>
</html>